单项选择题

Deck beams on a ship are generally spaced at equal intervals and run（）.

A.longitudinally
B.vertically
C.transversely
D.intermittently

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单项选择题

A.between sunset and sunrise
B.only between 8 AM and 4 PM
C.during daylight hours in any visibility
D.during daylight hours in unrestricted visibility only

单项选择题

Daylight savings time is a form of zone time that adopts the time（）.

A.one zone to the east
B.one zone to the west
C.two zones to the east
D.two zones to the west

单项选择题

Dacron sails，when not in use，may be damaged if（）.

A.left in the sunlight
B.stowed wet
C.washed with soap
D.folded frequently